1.	When the beat is loud (i.e., has a large amplitude), is the interference between the two waves constructive or destructive?

2.	When the beat is soft (i.e., has a small amplitude), what kind of interference is taking place between the two waves?

3.	One wave has a frequency of 420 Hz and it interferes with a second wave to produce sound with a beat frequency of 8 Hz. Is this enough information to determine the frequency of the second wave?